Display device

ABSTRACT

A display device includes: a display panel including a first area and a second area, wherein the first area includes first sub-pixels, and the second area includes second sub-pixels; and a power supply unit that generates a first driving voltage and a second driving voltage greater than the first driving voltage to supply the first and second driving voltages to the display panel. The first sub-pixels receive the first driving voltage, and the second sub-pixels receive the first driving voltage or the second driving voltage.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C § 119 to from KoreanPatent Application No. 10-2019-0102989, filed on Aug. 22, 2019, in theKorean Intellectual Property

Office, the disclosure of which is incorporated by reference herein inits entirety.

TECHNICAL FIELD

The present invention relates to a display device, and moreparticularly, to a display device including a power supply unitproviding a driving voltage to a display panel of the display device.

DISCUSSION OF THE RELATED ART

With the development of information society, applications of displaydevices for displaying images have increased. For example, displaydevices are applied to various electronic appliances such as smartphones, digital cameras, notebook computers, navigators, and smarttelevisions. A typical display device may include a display panelincluding a plurality of pixels connected to scan lines, data lines, andpower supply lines to display an image. Further, a display device mayinclude various sensor devices such as a proximity sensor for detectingwhether a user is located adjacent to the front surface of the displaydevice. In addition, a display device may include an illumination sensorfor detecting the luminance of incident light on the front surface ofthe display device, and an iris sensor for recognizing a user's iris.These sensor devices may be respectively disposed in holes disposed onthe front surface of the display device not overlapping a display panel.

As display devices are applied to various electronic appliances, displaydevices may have various forms and designs. For example, a smart phonemay widen a display area by removing holes disposed on the front surfaceof the display device. Although the sensor devices disposed on the frontsurface of the display device may be disposed to overlap the displaypanel, the number of pixels may be reduced by the area where the sensordevices are disposed.

SUMMARY

According to an exemplary embodiment of the present invention, a displaydevice includes: a display panel including a first area and a secondarea, wherein the first area includes first sub-pixels, and the secondarea includes second sub-pixels; and a power supply unit that generatesa first driving voltage and a second driving voltage greater than thefirst driving voltage to supply the first and second driving voltages tothe display panel. The first sub-pixels receive the first drivingvoltage, and the second sub-pixels receive the first driving voltage orthe second driving voltage.

In an exemplary embodiment of the present invention, the power supplyunit includes: a first driving voltage generator that generates thefirst driving voltage; and a second driving voltage generator thatgenerates the second driving voltage.

In an exemplary embodiment of the present invention, the power supplyunit further includes: a first switching element selectively connectingthe first driving voltage generator to the second sub-pixels; and asecond switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a mode selector that supplies first and second modesignals to the power supply unit, wherein the first switching elementreceives the first mode signal from the mode selector to be turned on,and the second switching element receives the second mode signal fromthe mode selector to be turned on.

In an exemplary embodiment of the present invention, the display devicefurther includes a display driving circuit that drives the displaypanel, wherein the display driving circuit includes: a first switchingelement selectively connecting the first driving voltage generator tothe second sub-pixels; and a second switching element selectivelyconnecting the second driving voltage generator to the secondsub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a mode selector that supplies first and second modesignals to the display driving circuit, wherein the first switchingelement receives the first mode signal from the mode selector to beturned on, and the second switching element receives the second modesignal from the mode selector to be turned on.

In an exemplary embodiment of the present invention, the display devicefurther includes a first switching unit mounted on a circuit board,wherein the power supply unit is mounted on the circuit board, whereinthe first switching unit includes: a first switching element selectivelyconnecting the first driving voltage generator to the second sub-pixels;and a second switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a mode selector that supplies first and second modesignals to the first switching unit, wherein the first switching elementreceives the first mode signal from the mode selector to be turned on,and the second switching element receives the second mode signal fromthe mode selector to be turned on.

In an exemplary embodiment of the present invention, the display devicefurther includes a second switching unit disposed on a substrate of thedisplay panel, wherein the second switching unit includes: a firstswitching element selectively connecting the first driving voltagegenerator to the second sub-pixels; and a second switching elementselectively connecting the second driving voltage generator to thesecond sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a mode selector supplying first and second mode signalsto the second switching unit, wherein the first switching elementreceives the first mode signal from the mode selector to be turned on,and the second switching element receives the second mode signal fromthe mode selector to be turned on.

In an exemplary embodiment of the present invention, the display panelincludes: a first horizontal voltage supply line disposed at one side ofthe first area; a first vertical voltage supply line connected to thefirst horizontal voltage supply line, wherein the first vertical voltagesupply line supplies the first driving voltage to the first sub-pixels;a second horizontal voltage supply line disposed at one side of thesecond area; and a second vertical voltage supply line connected to thesecond horizontal voltage supply line, wherein the second verticalvoltage supply line supplies the first driving voltage or the seconddriving voltage to the second sub-pixels.

In an exemplary embodiment of the present invention, the display panelfurther includes: a first switching element disposed between the firstvertical voltage supply line and the second vertical voltage supplyline; and a second switching element selectively supplying the seconddriving voltage to the second horizontal voltage supply line.

In an exemplary embodiment of the present invention, the display devicefurther includes a mode selector that supplies first and second modesignals to the first and second switching elements, wherein the firstswitching element receives the first mode signal from the mode selectorto be turned on, and the second switching element receives the secondmode signal from the mode selector to be turned on.

In an exemplary embodiment of the present invention, a number of thefirst sub-pixels per unit area of the first area is larger than a numberof the second sub-pixels per unit area of the second area.

According to an exemplary embodiment of the present invention, a displaydevice including: a display panel including a first area and a secondarea, wherein the first area includes first sub-pixels, and the secondarea includes second sub-pixels, wherein the display panel includes: afirst horizontal voltage supply line disposed at one side of the firstarea; a first vertical voltage supply line connected to the firsthorizontal voltage supply line, wherein the first vertical voltagesupply line supplies a first driving voltage to the first sub-pixels; asecond horizontal voltage supply line disposed at one side of the secondarea; and a second vertical voltage supply line connected to the secondhorizontal voltage supply line, wherein the second vertical voltagesupply line supplies the first driving voltage or a second drivingvoltage greater than the first driving voltage to the second sub-pixels.

In an exemplary embodiment of the present invention, wherein the firsthorizontal voltage supply line and the second horizontal voltage supplyline are disposed on a first layer disposed on a substrate of thedisplay panel, and the first vertical voltage supply line and the secondvertical voltage supply line are disposed on a second layer disposed onthe first layer. 100211 In an exemplary embodiment of the presentinvention, each of the first sub-pixels and the second sub-pixelsfurther includes a thin film transistor including an active layer, agate electrode, a source electrode, and a drain electrode, and whereinthe first horizontal voltage supply line and the second horizontalvoltage supply line are disposed on the same layer as the gateelectrode, and the first vertical voltage supply line and the secondvertical voltage supply line are disposed on the same layer as thesource electrode and the drain electrode.

In an exemplary embodiment of the present invention, the display devicefurther including a power supply unit including a first driving voltagegenerator that generates the first driving voltage and a second drivingvoltage generator that generates the second driving voltage.

In an exemplary embodiment of the present invention, the power supplyunit further includes: a first switching element selectively connectingthe first driving voltage generator to the second sub-pixels; and asecond switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a display driving circuit that drives the displaypanel, wherein the display driving circuit further includes: a firstswitching element selectively connecting the first driving voltagegenerator to the second sub-pixels; and a second switching elementselectively connecting the second driving voltage generator to thesecond sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a first switching unit mounted on a circuit board,wherein the power supply unit is mounted on the circuit board, whereinthe first switching unit includes: a first switching element selectivelyconnecting the first driving voltage generator to the second sub-pixels;and a second switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.

In an exemplary embodiment of the present invention, the display devicefurther includes a second switching unit disposed on a substrate of thedisplay panel, wherein the second switching unit includes: a firstswitching element selectively connecting the first driving voltagegenerator to the second sub-pixels; and a second switching elementselectively connecting the second driving voltage generator to thesecond sub-pixels.

In an exemplary embodiment of the present invention, the display panelincludes: a first switching element disposed between the first verticalvoltage supply line and the second vertical voltage supply line; and asecond switching element selectively connecting the second drivingvoltage generator to the second horizontal voltage supply line.

According to an exemplary embodiment of the present invention, a displaydevice, including: a display panel including a first area and a secondarea, wherein the first area includes first sub-pixels and a firstvoltage supply line connected to the first sub-pixels, wherein thesecond area includes second sub-pixels, a second voltage supply lineconnected to the second sub-pixels, and a plurality of sensors; a firstdriving voltage generator connected to the first sub-pixels and thatgenerates a first driving voltage; a second driving voltage generatorthat generates a second driving voltage; a first switching elementselectively connecting the first driving voltage generator to the secondvoltage supply line and the second sub-pixels; and a second switchingelement selectively connecting the second driving voltage generator tothe second voltage supply line and the second sub-pixels.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the present invention will become moreapparent by describing in detail exemplary embodiments thereof withreference to the accompanying drawings, in which:

FIG. 1 is a perspective view of a display device according to anexemplary embodiment of the present invention;

FIG. 2 is an exploded perspective view of a display device according toan exemplary embodiment of the present invention;

FIG. 3 is a plan view of a display device according to an exemplaryembodiment of the present invention;

FIG. 4 is a plan view of a display device according to an exemplaryembodiment of the present invention;

FIG. 5 is a view showing a display panel and a power supply unit of thedisplay device of FIG. 4, according to an exemplary embodiment of thepresent invention;

FIG. 6 is a detailed plan view of a display device according to anexemplary embodiment of the present invention;

FIG. 7 is a view showing a display panel and a power supply unit of thedisplay device of FIG. 6, according to an exemplary embodiment of thepresent invention;

FIG. 8 is a plan view of a display device according to an exemplaryembodiment of the present invention;

FIG. 9 is a view showing a display panel, a display driving circuit anda power supply unit of the display device of FIG. 8, according to anexemplary embodiment of the present invention;

FIG. 10 is a plan view of a display device according to exemplaryembodiment of the present invention;

FIG. 11 is a view showing a display panel, a power supply unit and afirst switching unit of the display device of FIG. 10, according to anexemplary embodiment of the present invention;

FIG. 12 is a plan view of a display device according to an exemplaryembodiment of the present invention;

FIG. 13 is a detailed plan view of a display device according to anexemplary embodiment of the present invention;

FIG. 14 is a plan view of a display device according to an exemplaryembodiment of the present invention;

FIG. 15 is a detailed plan view of a display device according to anexemplary embodiment of the present invention;

FIG. 16 is a plan view showing a pixel arrangement structure of a sensorarea according to an exemplary embodiment of the present invention;

FIG. 17 is a circuit diagram showing first sub-pixels according to anexemplary embodiment of the present invention;

FIG. 18 is a circuit diagram showing second sub-pixels according to anexemplary embodiment of the present invention; and

FIG. 19 is a cross-sectional view of a display device according to anexemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

As used herein “embodiments” and “implementations” are interchangeablewords that are non-limiting examples of the present invention disclosedherein. It is apparent, however, that various exemplary embodiments ofthe present invention may be practiced with one or more equivalentarrangements. It is to be understood that the present invention may,however, be embodied in different forms and thus should not be construedas being limited to the exemplary embodiments set forth herein. Forexample, shapes, configurations, and characteristics of an exemplaryembodiment of the present invention may be used or implemented inanother exemplary embodiment of the present invention without departingfrom the spirit and scope of the present invention.

It is to be understood, unless otherwise specified, that the features,components, modules, layers, films, panels, regions, and/or aspects,etc. (hereinafter individually or collectively referred to as“elements”) of various exemplary embodiments of the present inventionmay be otherwise combined, separated, interchanged, and/or rearrangedwithout departing from the spirit and scope of the present invention.

The use of cross-hatching and/or shading in the accompanying drawings isgenerally provided to clarify boundaries between adjacent elements. Assuch, neither the presence nor the absence of cross-hatching or shadingconveys or indicates any preference or requirement for particularmaterials, material properties, dimensions, proportions, commonalitiesbetween illustrated elements, and/or any other characteristic,attribute, property, etc., of the elements, unless specified. Further,in the accompanying drawings, the size and relative sizes of elementsmay be exaggerated for clarity and/or descriptive purposes. When anexemplary embodiment of the present invention may be implementeddifferently, a specific process order may be performed differently fromthe described order. For example, two consecutively described processesmay be performed substantially at the same time or performed in an orderopposite to the described order. Also, like reference numerals maydenote like elements, and thus repetitive descriptions may be omitted.

When an element, such as a layer, is referred to as being “on,”“connected to,” or “coupled to” another element or layer, the element orlayer may be directly on, connected to, or coupled to the other elementor layer or intervening elements or layers may be present therebetween.Further, the X-axis, the Y-axis, and the Z-axis are not limited to threeaxes of a rectangular coordinate system, such as the x, y, and z axes,and may be interpreted in a broader sense. For example, the X-axis, theY-axis, and the Z-axis may be perpendicular to one another, or mayrepresent different directions that are not perpendicular to oneanother. As used herein, the term “and/or” includes any and allcombinations of one or more of the associated listed items.

Although the terms “first,” “second,” etc. may be used herein todescribe various types of elements, these elements should not be limitedby these terms. These terms are used to distinguish one element fromanother element. Thus, a first element discussed below could be termed asecond element without departing from the spirit and scope of thepresent invention.

Spatially relative terms, such as “beneath,” “below,” “under,” “lower,”“above,” “upper,” “over,” “higher,” “side” (e.g., as in “sidewall”), andthe like, may be used herein for descriptive purposes, and, thereby, todescribe one elements relationship to another element(s) as illustratedin the drawings. Spatially relative terms are intended to encompassdifferent orientations of an apparatus in use, operation, and/ormanufacture in addition to the orientation depicted in the drawings. Forexample, if the apparatus in the drawings is turned over, elementsdescribed as “below” or “beneath” other elements or features would thenbe oriented “above” the other elements or features. Thus, in theexample, the term “below” or “beneath” can encompass both an orientationof above and below. Furthermore, the apparatus may be otherwise oriented(e.g., rotated 90 degrees or at other orientations), and, as such, thespatially relative descriptors used herein interpreted accordingly.

It is also noted that, as used herein, the terms “substantially,”“about,” and other similar terms, are used as terms of approximation andnot as terms of degree, and, as such, are utilized to account forinherent deviations in measured, calculated, and/or provided values thatwould be recognized by one of ordinary skill in the art.

Some exemplary embodiments of the present invention may be described andillustrated in the accompanying drawings in terms of functional blocks,units, and/or modules. Those skilled in the art will appreciate thatthese blocks, units, and/or modules are physically implemented byelectronic (or optical) circuits, such as logic circuits, discretecomponents, microprocessors, hard-wired circuits, memory elements,wiring connections, and the like, which may be formed usingsemiconductor-based fabrication techniques or other manufacturingtechnologies. In the case of the blocks, units, and/or modules beingimplemented by microprocessors or other similar hardware, they may beprogrammed and controlled using software (e.g., microcode) to performvarious functions discussed herein and may optionally be driven byfirmware and/or software. It is also understood that each block, unit,and/or module may be implemented by dedicated hardware, or as acombination of dedicated hardware to perform some functions and aprocessor (e.g., one or more programmed microprocessors and associatedcircuitry) to perform other functions. In addition, each block, unit,and/or module of an exemplary embodiment of the present invention may bephysically separated into two or more interacting and discrete blocks,units, and/or modules without departing from the spirit and scope of thepresent invention. Further, the blocks, units, and/or modules of anexemplary embodiment of the present invention may be physically combinedinto more complex blocks, units, and/or modules without departing fromthe spirit and scope of the present invention.

FIG. 1 is a perspective view of a display device according to anexemplary embodiment of the present invention, and FIG. 2 is an explodedperspective view of a display device according to an exemplaryembodiment of the present invention.

Referring to FIGS. 1 and 2, a display device 10 according to anexemplary embodiment of the present invention includes a cover window100, a display panel 300, a bracket 600, a main circuit board 700, and alower cover 900.

The display device 10, which is a device for displaying a moving imageor a still image, may be used as a display screen of various productssuch as televisions, notebooks, monitors, billboards, and internet ofthings, as well as portable electronic appliances such as mobile phones,smart phones, tablet personal computers (tablet PCs), smart watches,watch phones, mobile communication terminals, electronic notebooks,electronic books, portable multimedia players (PMPs), navigators, andultra mobile PCs.

The display device 10 may have a rectangular shape in a plan view. Forexample, as shown in FIGS. 1 and 2, the display device 10 may have arectangular planar shape having short sides in the first direction(X-axis direction) and long sides in the second direction (Y-axisdirection). The corner where the short side in the first direction(X-axis direction) meets the long side in the second direction (Y-axisdirection) may be formed to have a round shape of a predeterminedcurvature or have a right angle shape. The planar shape of the displaydevice 10 is not limited to a rectangular shape, and may be formed inanother polygonal shape, circular shape, or elliptical shape.

The display device 10 may include a first region DR1 formed flat and asecond region DR2 extending from the right and left sides of the firstregion DR1. The second region DR2 may be formed to be flat or curvedwith respect to the first region DR1. When the second region DR2 isformed to be flat, the angle formed by the first region DR1 and thesecond region DR2 may be an obtuse angle. When the second region DR2 isformed to be curved, the second region DR2 may have a constant curvatureor a variable curvature.

Although it is shown in FIG. 1 that the second region DR2 extends fromthe left and right sides of the first region DR1, the present inventionis not limited thereto. For example, the second region DR2 may extendfrom the left side or the right side of the first region DR1. Inaddition, the second region DR2 may extend from the upper side or thelower side of the first region DR1 in addition to extending from theleft side or right side of the first region DR1. Hereinafter, it may beassumed that the second region DR2 is disposed along the left and rightedges of the display device 10.

The cover window 100 may be disposed on the display panel 300 to coverthe upper surface of the display panel 300. The cover window 100 mayprotect the upper surface of the display panel 300.

The cover window 100 may be disposed in the first region DR1 and thesecond region DR2. The cover window 100 may include a display area DAand a light blocking area NDA at least partially surrounding the displayarea DA. Further, the display area DA may include a first lighttransmitting portion DA1 and a second light transmitting portion DA2.The first light transmitting portion DA1 and the second lighttransmitting portion DA2 may correspond to the display panel 300. Thelight blocking area NDA may correspond to an area other than the displaypanel 300. The second light transmitting portion DA2 may be disposed atone side of the first light transmitting portion DA1, for example, theupper side thereof as shown in FIGS. 1 and 2.

The first light transmitting portion DA1 and the second lighttransmitting portion DA2 may be disposed in the first region DR1 and thesecond region DR2. The light blocking area NDA100 may be formed to beopaque. In addition, the light blocking area NDA100 may be formed as adecorative layer having a pattern that can be seen to a user when animage is not displayed.

The display panel 300 may be disposed under the cover window 100. Thedisplay panel 300 may be disposed in the first region DR1 and the secondregions DR2. Thus, the image of the display panel 300 may be seen notonly in the first region DR1 but also in the second regions DR2 throughthe cover window 100. For example, the image of the display panel 300may be seen from the upper surface and left and right edges of thedisplay device 100 through the cover window 100.

The display panel 300 may be a light emitting display panel including alight emitting element. Examples of the display panel 300 may include anorganic light emitting display panel using an organic light emittingdiode including an organic light emitting layer, an ultra-micro lightemitting diode display panel using an ultra-micro light emitting diode(ultra-micro LED, a quantum dot light emitting diode display panel usinga quantum dot light emitting diode including a quantum dot lightemitting layer, and an inorganic light emitting display panel using aninorganic light emitting diode including an inorganic semiconductor.Hereinafter, the display panel 300 is an organic light emitting displaypanel as an example, but the present invention is not limited thereto.

The display panel 300 may include a main area MA and a protrusion areaPA protruding from one side of the main area MA.

The main area MA may include a general area MDA, a sensor area SDA, anda non-display area NDA.

The display panel 300 may include a general area MDA and a sensor areaSDA. The general area MDA may be disposed to overlap the first lighttransmitting portion DA1 of the cover window 100. The sensor area SDAmay be disposed to overlap the second light transmitting portion DA2 ofthe cover window 100. The sensor area SDA may be disposed at one side ofthe general area MDA, for example, the upper side thereof as shown inFIG. 2, but the present invention is not limited thereto. As anotherexample, the sensor area SDA may be disposed to be surrounded by thegeneral area MDA, and may be disposed adjacent to the corners of thedisplay panel 300. Although it is shown in FIG. 2 that the display panel300 includes one sensor area SDA, the present invention is not limitedthereto. For example, the display panel 300 may include a plurality ofsensor areas SDA.

Each of the general area MDA and the sensor area SDA may include aplurality of pixels, scan lines and data lines connected to theplurality of pixels, and a power supply line.

The non-display area NDA may be an edge area of the display panel 300.The non-display area NDA may include a scan driver for applying scansignals to the scan lines, and link lines connecting the data lines to adisplay driving circuit 310.

The protrusion area PA may protrude from one side of the main area MA.As shown in FIG. 3, the protrusion area PA may protrude from the lowerside of the general area MDA. For example, the protrusion area PA andthe sensor area SDA may be at different sides of the general area MDAfrom each other, but the present invention is not limited thereto. As anadditional example, the length of the protrusion area PA in the firstdirection (X-axis direction) may be smaller than the length of the mainarea MA in the first direction (X-axis direction).

The protrusion area PA may include a bending area BA and a pad area PDA.In this case, the pad area PDA may be disposed at one side of thebending area BA, and the main area MA may be disposed at the other sideof the bending area BA. For example, the pad area PDA may be disposed atthe lower side of the bending area BA, and the main area MA may bedisposed at the upper side of the bending area BA.

The display panel 300 may be formed to be curved, warped, bent, folded,or rolled. For example, the display panel 300 may be flexible.Therefore, the display panel 300 may be bent in the thickness direction(Z-axis direction) in the bending area BA.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, and a touch driving circuit340.

The display driving circuit 310 may output signals and voltages fordriving the display panel 300. For example, the display driving circuit310 may supply a data voltage to a data line. In addition, the displaydriving circuit 310 may supply a power supply voltage to a power supplyline, and may supply a scan control signal to a scan driver.

The circuit board 320 may be attached onto the pads of the pad area PDAusing an anisotropic conductive film (ACF). The lead lines of thecircuit board 320 may be electrically connected to the pads of thedisplay panel 300. For example, the circuit board 320 may be a flexibleprinted circuit board (FPCB), a printed circuit board (PCB), or aflexible film such as a chip on film (COF).

The power supply unit 330 (or, e.g., a power supply) may be disposed onthe circuit board 320 to supply driving voltages to the display drivingcircuit 310 and the display panel 300. For example, the power supplyunit 330 may generate a first driving voltage and supply the firstdriving voltage to a first driving voltage line, and may generate asecond driving voltage and supply the second driving voltage to a seconddriving voltage line. Further, the power supply unit 330 may generate athird driving voltage and supply the third driving voltage to a cathodeelectrode of an organic light emitting diode of each of the first andsecond sub-pixels. For example, the first and second driving voltagesmay be high-potential voltages for driving a light emitting element, forexample, an organic light emitting diode, and the second driving voltagemay be a high-potential voltage greater than the first driving voltage.The third driving voltage may be a low-potential voltage for driving theorganic light emitting diode.

The touch driving circuit 340 may be disposed on the circuit board 320to measure capacitances of touch electrodes. For example, the touchdriving circuit 340 may determine a user's touch and a user's touchposition on the basis of the change in capacitance of the touchelectrodes. Here, the user's touch may be an object such as a user'sfinger or pen that directly contacts one surface of the display device10 disposed on the touch sensing layer. The touch driving circuit 340may determine the user's touch position by distinguishing a portionwhere a user touch occurs from a portion where the user touch does notoccur among the plurality of touch electrodes.

The bracket 600 may be disposed under the display panel 300. The bracket600 may include, for example, plastic, metal, or a combination thereof.For example, the bracket 600 may include a first camera hole CMH1 intowhich a first camera sensor 720 is inserted, a battery hole BH in whicha battery is disposed, and a cable hole CAH through which a cableconnected to the display driving circuit 310 or the circuit board 320passes, and a sensor hole SH in which sensor devices 740, 750, 760, and770 are disposed. As another example, instead of including the sensorhole SH, the bracket 600 may be formed so as not to overlap the sensorarea SDA of the display panel 300.

The main circuit board 700 and a battery 790 may be disposed under thebracket 600. For example, the main circuit board 700 may be a printedcircuit board or a flexible printed circuit board.

The main circuit board 700 may include a main processor 710, a firstcamera sensor 720, a main connector 730, and sensor devices 740, 750,760, and 770. For example, the first camera sensor 720 may be disposedon both the upper surface and lower surface of the main circuit board700. In addition, the main processor 710 may be disposed on the uppersurface of the main circuit board 700, and the main connector 730 may bedisposed on the lower surface of the main circuit board 700. The sensordevices 740, 750, 760, 770 may be disposed on the upper surface of themain circuit board 700.

The main processor 710 may control the functions of the display device10. For example, the main processor 710 may output digital video data tothe display driving circuit 310 such that the display panel 300 displaysan image. Further, the main processor 710 may receive touch data fromthe touch driving circuit 340, determine the touch coordinates of auser, and then execute an application indicated by an icon displayed atthe touch coordinates of the user.

The main processor 710 may control the display device 10 according tosensor signals input from the sensor devices 740, 750, 760, and 770. Forexample, the main processor 710 may determine whether an object islocated close the upper surface of the display device 10 according to aproximity sensor signal input from the proximity sensor 740. Forexample, when the object is located close to the upper surface of thedisplay device 10 in the call mode as detected by the proximity sensor740, the main processor 710 may not execute an application indicated byan icon displayed at the touch coordinates even if a touch is executedby a user.

The main processor 710 may determine the brightness of the upper surfaceof the display device 10 according to an illumination sensor signalinput from the illumination sensor 750.

The main processor 710 may adjust the luminance of an image displayed bythe display panel 300 according to the brightness or luminance ofincident light on an upper surface of the display device 10.

The main processor 710 may determine whether an iris image of the useris the same as the iris image previously stored in the memory accordingto an iris sensor signal input from the iris sensor 760. When the irisimage of the user is the same as the iris image previously stored in thememory, the main processor 710 may unlock the display device 10 anddisplay a home screen on the display panel 300.

The first camera sensor 720 may process an image frame such as a stillimage or a moving image obtained by the image sensor, and output theprocessed image frame to the main processor 710. For example, the firstcamera sensor 720 may be a CMOS image sensor or a CCD sensor, but thepresent invention is not limited thereto. The first camera sensor 720may be exposed to the lower surface of the lower cover 900 by the secondcamera hole CMH2, and may photograph an object or a background disposedunder the display device 10 or outside of the display device 10.

The cable having passed through the cable hole CAH of the bracket 600may be connected to the main connector 730. Thus, the main circuit board700 may be electrically connected to the display driving circuit 310 orthe circuit board 320.

The sensor devices may include a proximity sensor 740, an illuminationsensor 750, an iris sensor 760, and a second camera sensor 770.

The proximity sensor 740 may detect whether an object is located closeto the upper surface of the display device 10. For example, theproximity sensor 740 may include a light source that outputs light and alight receiver that receives light reflected by the object. Theproximity sensor 740 may determine whether an object located closed tothe upper surface of the display device 10 exists according to theamount of light reflected by the object. Since the proximity sensor 740is disposed to overlap the sensor hole SH, the sensor area SDA of thedisplay panel 300, and the second light transmitting portion DA2 of thecover window 100 in the thickness direction (Z-axis direction) of thedisplay panel 300, the proximity sensor 740 may generate a proximitysensor signal depending on whether the object located closed to theupper surface of the display device 10 exists, and may output theproximity signal to the main processor 710.

The illumination sensor 750 may detect the brightness of the uppersurface of the display device 10. The illumination sensor 750 mayinclude a resistor whose resistance value changes depending on thebrightness of incident light. The illumination sensor 750 may determinethe brightness of the upper surface of the display device 10 dependingon the resistance value of the resistor. Since the illumination sensor750 is disposed to overlap the sensor hole SH, the sensor area SDA ofthe display panel 300, and the second light transmitting portion DA2 ofthe cover window 100 in the thickness direction (Z-axis direction) ofthe display panel 300, the illumination sensor 750 may generate anillumination sensor signal depending on the brightness of the uppersurface of the display device 10, and may output the illumination sensorsignal to the main processor 710.

The iris sensor 760 may detect whether an image of a user's iris is thesame as the iris image previously stored in the memory. The iris sensor760 may generate an iris sensor signal depending on whether the image ofthe user's iris is the same as the iris image previously stored in thememory, and may generate the iris sensor signal to the main processor710.

The second camera sensor 770 may process an image frame such as a stillimage or a moving image obtained by the image sensor, and output theprocessed image frame to the main processor 710. For example, the secondcamera sensor 770 may be a CMOS image sensor or a CCD sensor, but thepresent invention is not limited thereto. The number of pixels in thesecond camera sensor 770 may be smaller than the number of pixels in thefirst camera sensor 720, and the size of the second camera sensor 770may be smaller than the size of the first camera sensor 720. Since thesecond camera sensor 770 is disposed to overlap the sensor hole SH, thesensor area SDA of the display panel 300, and the second lighttransmitting portion DA2 of the cover window 100 in the thicknessdirection (Z-axis direction) of the display panel 300, the second camerasensor 770 may photograph an object or a background disposed on thedisplay device 10. For example, the second camera sensor 770 mayphotograph an object or a background facing the front surface (or, e.g.,upper surface) of the display device 10.

The battery 790 may be disposed not to overlap the main circuit board700 in the third direction (Z-axis direction). The battery 790 mayoverlap the battery hole BH of the bracket 600.

The main circuit board 700 may include a mobile communication modulecapable of transmitting and receiving a radio signal to/from at leastone of a base station, an external terminal, and/or a server. The radiosignal may include various types of data depending on a voice signal, avideo call signal, or a text/multimedia message transmission/reception.

The lower cover 900 may be disposed under the main circuit board 700 andthe battery 790. The lower cover 900 may be engaged and fixed to thebracket 600. The lower cover 900 may form a lower surface of the displaydevice 10. The lower cover 900 may be made of, for example, plastic,metal, or a combination thereof.

The lower cover 900 may include a second camera hole CMH2 through whichthe lower surface of the first camera sensor 720 is exposed. However,the present invention is not limited to the position of the first camerasensor 720 and the positions of the first and second camera holes CMH1and CMH2 corresponding to the first camera sensor 720 shown in FIG. 2.

FIG. 4 is a plan view of a display device according to an exemplaryembodiment of the present invention, and FIG. 5 is a view showing adisplay panel and a power supply unit of the display device of FIG. 4,according to an exemplary embodiment of the present invention.

Referring to FIGS. 4 and 5, the display panel 300 may include a generalarea MDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EL, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may be connected to at least one scan line SL,at least one data line DL, at least one emission control line EL, and atleast one first voltage supply line VL1. Although it is shown in FIG. 4that each of the first sub-pixels SP1 may be connected to two scan linesSL, one data line DL, one emission control line EL, and one firstvertical voltage supply line VL1 v, the present invention is not limitedthereto. For example, each of the first sub-pixels SP1 may be connectedto three or more scan lines SL.

Each of the first sub-pixels SP1 may include a driving transistor, atleast one switching transistor, a light emitting element, and acapacitor. The driving transistor may emit light by supplying a drivingcurrent to the light emitting element according to a data voltageapplied to a gate electrode. For example, the driving transistor and theat least one switching transistor may be thin film transistors. Thelight emitting element may emit light having a predetermined luminanceaccording to the magnitude of the driving current of the drivingtransistor. For example, the light emitting element may be an organiclight emitting diode including a first electrode, an organic lightemitting layer, and a second electrode. The capacitor may maintain thedata voltage applied to the gate electrode of the driving transistor.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, for example, the firstdriving voltage VDD1 may be a high-potential voltage for driving thelight emitting elements of the first sub-pixels SP1.

The first voltage supply line VL1 may include a first horizontal voltagesupply line VL1 h and a first vertical voltage supply line VL1 v.

The first horizontal voltage supply line VL1 h may be disposed at oneside of the general area MDA. For example, the first horizontal voltagesupply line VL1 h may be disposed at one side of the general area MDArelatively adjacent to the display driving circuit 310 or the powersupply unit 330. For example, the first horizontal voltage supply lineVL1 h may be disposed at the lower side of the general area MDA, but thepresent invention is not limited thereto.

The first horizontal voltage supply line VL1 h may extend in the firstdirection (X-axis direction), and may be connected to the plurality offirst vertical voltage supply lines VL1 v. The first horizontal voltagesupply line VL may supply the first driving voltage VDD1 supplied fromthe display driving circuit 310 to the plurality of first verticalvoltage supply lines VL1 v.

The plurality of first vertical voltage supply lines VL1 v may be spacedapart from each other in the first direction (X-axis direction), and mayextend in the second direction (Y-axis direction). For example, each ofthe plurality of first vertical voltage supply lines VL1 v may bedisposed along a column of first sub-pixels SP1 disposed in the generalarea MDA. Each of the plurality of first vertical voltage supply linesVL1 v may be connected to the first sub-pixels SP1 arranged in the samecolumn, and may supply the first driving voltage VDD1 to the firstsub-pixels SP1.

In an exemplary embodiment of the present invention, the firsthorizontal voltage supply line VL1 h and the first vertical voltagesupply line VL1 v may be disposed on different layers on a substrate ofthe display panel 300. The first horizontal voltage supply line VL1 hmay be disposed on a first layer on the substrate, and the firstvertical voltage supply line VL1 v may be disposed on a second layer,which is disposed on the first layer. The first horizontal voltagesupply line VL1 h and the first vertical voltage supply line VL1 v maybe connected to each other through a contact hole. For example, thefirst horizontal voltage supply line VL1 h may be disposed on the samelayer as the gate electrode of the thin film transistor on thesubstrate, and the first vertical voltage supply line VL1 v may bedisposed on the same layer as the source electrode and drain electrodeof the thin film transistor, but the present invention is not limitedthereto.

The scan lines SL and the emission control lines EL may extend in thefirst direction (X-axis direction), and may be spaced apart from eachother in the second direction (Y-axis direction) crossing the firstdirection (X-axis direction). The scan lines SL and the emission controllines EL may be formed in parallel with the first horizontal voltagesupply line VL1 h.

The data lines DL may extend in the second direction (Y-axis direction),and may be spaced apart from each other in the first direction (X-axisdirection). The data lines DL may be formed in parallel with the firstvertical voltage supply line VL1 v.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, emission control lines EL, and datalines DL.

The second sub-pixels SP2 may be connected to at least one scan line SL,at least one data line DL, at least one emission control line EL, and atleast one second voltage supply line VL2. Although it is shown in FIG. 4that each of the second sub-pixels SP2 may be connected to two scanlines SL, one data line DL, one emission control line EML, and onesecond vertical voltage supply line VL2 v, the present invention is notlimited thereto. For example, each of the second sub-pixels SP2 may beconnected to three or more scan lines SL.

Each of the second sub-pixels SP2 may include a driving transistor, atleast one switching transistor, a light emitting element, and acapacitor.

The second sub-pixels SP2 may receive a second driving voltage VDD2through second voltage supply lines VL2. Here, for example, the seconddriving voltage VDD2 may be a high-potential voltage for driving thelight emitting elements of the second sub-pixels SP2. The second drivingvoltage VDD2 may be greater than the first driving voltage VDD1 suppliedto the first sub-pixels SP1. The display device 10 may supply the firstdriving voltage VDD1 to the first sub-pixels SP1 in the first mode andsupply the second driving voltage VDD2 to the second sub-pixels SP2 inthe first mode, thereby making the luminance of the general area MDA andthe luminance of the sensor area SDA substantially uniform.

The number of first sub-pixels SP1 per unit area of the general area MDAmay be larger than the number of second sub-pixels SP2 per unit area ofthe sensor area SDA. The general area MDA is an area for displaying animage, which is a function of the display device 10, and the firstsub-pixels SP1 may be densely arranged in the general area MDA. Thesensor area SDA may include a pixel area in which the second sub-pixelsSP2 are arranged, and a transmission area that transmits light.Accordingly, as the area of the transmission area of the sensor area SDAincreases, the number of second sub pixels SP2 per unit area may besmaller than the number of first sub pixels SP1 per unit area.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areaand the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is the same as thearea of the transmission area of the sensor area SDA, the number ofsecond sub pixels SP2 per unit area may correspond to about half of thenumber of first sub pixels SP1 per unit area. Thus, the luminance of thesensor area SDA may correspond to about half of the luminance of thegeneral area MDA. Accordingly, the display device 10 may set themagnitude of the second driving voltage VDD2 to be about 2^((1/2)) timesor about 1.414 times of the first driving voltage VDD1, thereby makingthe luminance of the sensor area SDA and the luminance of the generalarea MDA substantially uniform. The display device 10 may prevent thereduction of the luminance of the sensor area SDA by controlling themagnitude of the second driving voltage VDD2 based on the ratio of thenumber of the first sub-pixels SP1 and the number of the secondsub-pixels SP2.

The second voltage supply line VL2 may include a second horizontalvoltage supply line VL2 h and a second vertical voltage supply line VL2v.

The second horizontal voltage supply line VL2 h may be disposed in thesensor area SDA. For example, the second horizontal voltage supply lineVL2 h may be disposed at one side of the sensor area SDA. As anadditional example, the second horizontal voltage supply line VL2 h maybe disposed between an upper side of the display panel 300 and an upperside of the general area MDA. As an additional example, the secondhorizontal voltage supply line VL2 h may be disposed between an upperside of the sensor area SDA and the upper side of the general area MDA.For example, the second horizontal voltage supply line VL2 h may bedisposed at the lower side of the sensor area SDA or the upper side ofthe general area MDA, but the present invention is not limited thereto.

The second horizontal voltage supply line VL2 h may extend in the firstdirection (X-axis direction), and may be connected to the plurality ofsecond vertical voltage supply lines VL2 v. The second horizontalvoltage supply line VL2 h may supply the second driving voltage VDD2supplied from the display driving circuit 310 to the plurality of secondvertical voltage supply lines VL2 v.

The plurality of second vertical voltage supply lines VL2 v may bespaced apart from each other in the first direction (X-axis direction)and may extend in the second direction (Y-axis direction). For example,each of the plurality of second vertical voltage supply lines VL2 v maybe disposed along a column of second sub-pixels SP2 disposed in thesensor area SDA. Each of the plurality of second vertical voltage supplylines VL2 v may be connected to the second sub-pixels SP2 arranged inthe same column, and may supply the second driving voltage VDD2 to thesecond sub-pixels SP2.

The second horizontal voltage supply line VL2 h and the second verticalvoltage supply line VL2 v may be disposed on different layers on asubstrate of the display panel 300. The second horizontal voltage supplyline VL2 h may be disposed on a first layer on the substrate, and thesecond vertical voltage supply line VL2 v may be disposed on a secondlayer, which is disposed on the first layer. The second horizontalvoltage supply line VL2 h and the second vertical voltage supply lineVL2 v may be connected to each other through a contact hole. Forexample, the second horizontal voltage supply line VL2 h may be disposedon the same layer as the gate electrode of the thin film transistor onthe substrate, and the second vertical voltage supply line VL2 v may bedisposed on the same layer as the source electrode and drain electrodeof the thin film transistor, but the present invention is not limitedthereto.

The non-display area NDA may be a remaining area of the display panel300 except for the general area MDA and the sensor area SDA. Thenon-display area NDA may include a scan driver 410 for applying scansignals to the scan lines SL, fan-out lines FL for connecting the datalines DL and the display driving circuit 310 to each other, and pads DPconnected to the circuit board 320. The display driving circuit 310 andthe pads DP may be disposed in the pad area PDA of the display panel300. The pads DP may be disposed closer to one edge of the pad area PDAthan the display driving circuit 310.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,and a mode selector 350.

The display driving circuit 310 may be connected to the pads to receivedigital video data and timing signals. The display driving circuit 310may convert the digital video data into analog positive/negative datavoltages and supply the analog positive/negative data voltages to thedata lines DL through the fan-out lines FL.

The display driving circuit 310 may generate a scan control signal andsupply the scan control signal to the scan driver 410 through the firstscan control lines SCL1. The scan driver 410 may supply scan signals tothe first and second sub-pixels SP1 and SP2 based on the scan controlsignal, and may thus select pixels to which data voltages are to besupplied.

The display driving circuit 310 may generate an emission control signaland supply the emission control signal to an emission control driver 420through the second scan control lines SCL2. The emission control driver420 may generate emission signals according to the emission controlsignal, and sequentially output the emission signals to the emissioncontrol lines EL.

For example, the display driving circuit 310 may be formed as anintegrated circuit (IC), and may be attached onto the substrate SUB by achip on glass (COG) method, a chip on plastic (COP) method, or anultrasonic bonding method. However, the present invention is not limitedthereto.

The circuit board 320 may be attached onto the pads using an anisotropicconductive film (ACF). The lead lines of the circuit board 320 may beelectrically connected to the pads of the display panel 300. Forexample, the circuit board 320 may be a flexible printed circuit board(FPCB), a printed circuit board (PCB), or a flexible film such as a chipon film (COF).

The power supply unit 330 may be disposed on the circuit board 320 tosupply a driving voltage to the first and second sub-pixels SP1 and SP2.The power supply unit 330 may generate a driving voltage and supply thedriving voltage to the first and second sub-pixels SP1 and SP2 of thedisplay panel 300, the display driving circuit 310, the scan driver 410,and the emission control driver 420.

The power supply unit 330 may include a first driving voltage generator331 and a second driving voltage generator 332.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstvoltage supply line VL1. The first voltage supply line VL1 may beconnected to the display driving circuit 310 from the first drivingvoltage generator 331, and may be connected to the first sub-pixels SP1from the display driving circuit 310. Accordingly, the first sub-pixelsSP1 may receive the first driving voltage VDD1 through the first voltagesupply line VL1.

The second driving voltage generator 332 may generate a second drivingvoltage VDD2 and supply the second driving voltage VDD2 to the secondvoltage supply line VL2. The second voltage supply line VL2 may beconnected to the display driving circuit 310 from the second drivingvoltage generator 332, and may be connected to the second sub-pixels SP2from the display driving circuit 310. Accordingly, the second sub-pixelsSP2 may receive the second driving voltage VDD2 through the secondvoltage supply line VL2.

Accordingly, the power supply unit 330 may supply the first drivingvoltage VDD1 to the first sub pixels SP1 and supply the second drivingvoltage VDD2 to the second sub pixels SP2, thereby making the luminanceof the general area MDA and the luminance of the sensor area SDAsubstantially uniform.

In addition, the power supply unit 330 may generate driving voltages fordriving the display driving circuit 310, the scan driver 410, and theemission control driver 420, for example, a display driving voltage, agate high voltage, and a gate low voltage. Further, the power supplyunit 330 may supply these driving voltages to the display drivingcircuit 310.

The touch driving circuit 340 may be disposed on the circuit board 320to measure capacitances of touch electrodes. For example, the touchdriving circuit 340 may determine a user's touch and a user's touchposition on the basis of the change in capacitance of the touchelectrodes. Here, the user's touch means that an object such as a user'sfinger or pen directly contacts one surface of the display device 10disposed on a touch sensing layer. The touch driving circuit 340 maydetermine the user's touch position by distinguishing a portion where auser's touch occurs from a portion where the user's touch does not occuramong the plurality of touch electrodes.

As shown in FIG. 4, the scan driver 410 may be disposed outside one sideof the general area MDA and one side the sensor area SDA or may bedisposed at one side of the non-display area NDA. For example, the scandriver 410 may be disposed adjacent to one side of the general area MDAand one side of the sensor area SDA while disposed in the non-displayarea NDA. The emission control driver 420 may be disposed outside theother side of the general area MDA and the other side of the sensor areaSDA or may be disposed at the other side of the non-display area NDA.For example, the emission control driver 420 may be disposed adjacent tothe other side of the general area MDA and the other side of the sensorarea SDA while disposed in the non-display area NDA. As another example,both the scan driver 410 and the emission control driver 420 may bedisposed outside one side of the general area MDA and one side thesensor area SDA. As an additional example, the scan driver 410 and theemission control driver 420 may be respectively disposed at opposingsides of the non-display area NDA.

The scan driver 410 may include a plurality of thin film transistors forgenerating scan signals according to the scan control signal, and theemission control driver 420 may include a plurality of thin filmtransistors for generating emission signals according to the emissioncontrol signal. For example, the thin film transistors of the scandriver 410 and the thin film transistors of the emission control driver420 may be formed on the same layer as the thin film transistors of eachof the first and second sub-pixels SP1 and SP2.

For example, the first horizontal voltage supply line VL1 h and thesecond horizontal voltage supply line VL2 h may be disposed on the samelayer as the gate electrode of the thin film transistor of the scandriver 410 or the emission control driver 420. For example, the firstvertical voltage supply line VL1 v and the second vertical voltagesupply line VL2 v may be disposed on the same layer as the sourceelectrode and drain electrode of the thin film transistor of the scandriver 410 or the emission control driver 420.

FIG. 6 is a plan view of a display device according to an exemplaryembodiment of the present invention, and FIG. 7 is a view showing adisplay panel and a power supply unit of the display device of FIG. 6,according to an exemplary embodiment of the present invention. Thedisplay device of FIGS. 6 and 7 is different from the aforementioneddisplay device in that the configuration of the power supply unit isdifferent and a mode selector 250 is further provided. Therefore,configurations that are the same as the above-described configurationsmay be briefly described or omitted.

Referring to FIGS. 6 and 7, the display panel 300 may include a generalarea MDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EML, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, the first driving voltageVDD1 may be a high-potential voltage for driving the light emittingelements of the first sub-pixels SP1.

The first voltage supply line VL1 may include a first horizontal voltagesupply line VL1 h and a first vertical voltage supply line VL1 v.

The first horizontal voltage supply line VL1 h may be disposed at oneside of the general area MDA. For example, the first horizontal voltagesupply line VL1 h may be disposed at one side of the general area MDArelatively adjacent to the display driving circuit 310 or the powersupply unit 330. For example, the first horizontal voltage supply lineVL1 h may be disposed at the lower side of the general area MDA, but thepresent invention is not limited thereto.

The first horizontal voltage supply line VL1 h may extend in the firstdirection (X-axis direction), and may be connected to the plurality offirst vertical voltage supply lines VL1 v. The first horizontal voltagesupply line VL1 h may supply the first driving voltage VDD1 suppliedfrom the display driving circuit 310 to the plurality of first verticalvoltage supply lines VL1 v.

The plurality of first vertical voltage supply lines VL1 v may be spacedapart from each other in the first direction (X-axis direction), and mayextend in the second direction (Y-axis direction). For example, each ofthe plurality of first vertical voltage supply lines VL1 v may bedisposed along a column of first sub-pixels SP1 disposed in the generalarea MDA. Each of the plurality of first vertical voltage supply linesVL1 v may be connected to the first sub-pixels SP1 arranged in the samecolumn, and may supply the first driving voltage VDD1 to the firstsub-pixels SP1.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, and emission control lines EML, anddata lines DL. In addition, the second voltage supply lines VL2 areconnected to the second sub-pixels SP2.

The second sub-pixels SP2 may receive a first driving voltage VDD1 or asecond driving voltage VDD2 through second voltage supply lines VL2.Here, the first driving voltage VDD1 may be a high-potential voltage fordriving the light emitting elements of the second sub-pixels SP2 in thefirst mode or the power saving mode, and the second driving voltage VDD2may be a high-potential voltage for driving the light emitting elementsof the second sub-pixels SP2 in the second mode or the general mode(e.g., a normal operational mode). The second driving voltage VDD2 maybe greater than the first driving voltage VDD1. The display device 10may supply the first driving voltage VDD1 to the second sub-pixels SP2in the first mode to reduce the power consumption of the display device10, and may supply the second driving voltage VDD2 to the secondsub-pixels SP2 in the second mode to make the luminance of the generalarea MDA and the luminance of the sensor area SDA substantially uniform.

The second voltage supply line VL2 may include a second horizontalvoltage supply line VL2 h and a second vertical voltage supply line VL2v.

The second horizontal voltage supply line VL2 h may be disposed at oneside of the sensor area SDA. For example, the second horizontal voltagesupply line VL2 h may be disposed between the sensor area SDA and thegeneral area MDA. For example, the second horizontal voltage supply lineVL2 h may be disposed at the lower side of the sensor area SDA or theupper side of the general area MDA, but the present invention is notlimited thereto.

The second horizontal voltage supply line VL2 h may extend in the firstdirection (X-axis direction), and may be connected to the plurality ofsecond vertical voltage supply lines VL2 v. The second horizontalvoltage supply line VL2 h may supply the first driving voltage VDD1 orsecond driving voltage VDD2 supplied from the display driving circuit310 to the plurality of second vertical voltage supply lines VL2 v.

The plurality of second vertical voltage supply lines VL2 v may bespaced apart from each other in the first direction (X-axis direction)and may extend in the second direction (Y-axis direction). For example,each of the plurality of second vertical voltage supply lines VL2 v maybe disposed along a column of second sub-pixels SP2 disposed in thesensor area SDA. Each of the plurality of second vertical voltage supplylines VL2 v may be connected to the second sub-pixels SP2 arranged inthe same column, and may supply the first or second driving voltage VDD1or VDD2 to the second sub-pixels SP2.

The second horizontal voltage supply line VL2 h and the second verticalvoltage supply line VL2 v may be disposed on different layers on asubstrate of the display panel 300. The second horizontal voltage supplyline VL2 h may be disposed on a first layer on the substrate, and thesecond vertical voltage supply line VL2 v may be disposed on a secondlayer disposed on the first layer. The second horizontal voltage supplyline VL2 h and the second vertical voltage supply line VL2 v may beconnected to each other through a contact hole. For example, the secondhorizontal voltage supply line VL2 h may be disposed on the same layeras the gate electrode of the thin film transistor on the substrate, andthe second vertical voltage supply line VL2 v may be disposed on thesame layer as the source electrode and drain electrode of the thin filmtransistor, but the present invention is not limited thereto.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,and a mode selector 350.

The power supply unit 330 may be disposed on the circuit board 320 tosupply a driving voltage to the first and second sub-pixels SP1 and SP2.The power supply unit 330 may generate a driving voltage and supply thedriving voltage to the first and second sub-pixels SP1 and SP2 of thedisplay panel 300, the display driving circuit 310, the scan driver 410,and the emission control driver 420.

The power supply unit 330 may include a first driving voltage generator331 and a second driving voltage generator 332, a first switchingelement SW1, and a second switching element SW2.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstvoltage supply line VL1. The first voltage supply line VL1 may beconnected to the display driving circuit 310 from the first drivingvoltage generator 331, and may be connected to the first sub-pixels SP1from the display driving circuit 310. Accordingly, the first sub-pixelsSP1 may receive the first driving voltage VDD1 through the first voltagesupply line VL1.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstswitching element SW1. The first switching element SW1 may selectivelysupply the first driving voltage VDD1 to the second voltage supply lineVL2 based on a first mode signal MS1. For example, the first switchingelement SW1 may receive the first mode signal MS1 from the mode selector350 to be turned on. The mode selector 350 may supply the first modesignal MS1 to the first switching element SW1 of the power supply unit330 in the first mode or the power saving mode. Accordingly, the secondsub-pixels SP2 may receive the first driving voltage VDD1 through thesecond voltage supply line VL2 in the first mode.

The second driving voltage generator 332 may generate a second drivingvoltage VDD2 and supply the second driving voltage VDD2 to the secondswitching element SW2. The second switching element SW2 may selectivelysupply the second driving voltage VDD2 to the second voltage supply lineVL2 connected to the second sub-pixels SP2 based on a second mode signalMS2. For example, the second switching element SW2 may receive thesecond mode signal MS2 from the mode selector 350 to be turned on. Themode selector 350 may supply the second mode signal MS2 to the secondswitching element SW2 of the power supply unit 330 in the second mode orthe general mode. Accordingly, the second sub-pixels SP2 may receive thesecond driving voltage VDD2 through the second voltage supply line VL2in the second mode.

Accordingly, the power supply unit may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform.

The mode selector 350 may be disposed on the circuit board 320 to supplythe first or second mode signals MS1 or MS2 to the power supply unit330. For example, the mode selector 350 may supply the first mode signalMS1 to the first switching element SW1 in the first mode, and may supplythe second mode signal MS2 to the second switching element SW2 in thesecond mode.

FIG. 8 is a plan view of a display device according to an exemplaryembodiment of the present invention, and FIG. 9 is a view showing adisplay panel, a display driving circuit and a power supply unit of thedisplay device of FIG. 8, according to an exemplary embodiment of thepresent invention. The display device of FIGS. 8 and 9 is different fromthe aforementioned display device in that the configuration of supplyingfirst and second driving voltages VDD1 and VDD2 is different. Therefore,configurations that are the same as the above-described configurationsmay be briefly described or omitted.

Referring to FIGS. 8 and 9, the display panel 300 may include a generalarea MDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EML, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, the first driving voltageVDD1 may be a high-potential voltage for driving the light emittingelements of the first sub-pixels SP1. The first voltage supply line VL1may include a first horizontal voltage supply line VL1 h and a firstvertical voltage supply line VL1 v.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, and emission control lines EML, anddata lines DL. In addition, the second voltage supply lines VL2 areconnected to the second sub-pixels SP2.

The second sub-pixels SP2 may receive a first driving voltage VDD1 or asecond driving voltage VDD2 through second voltage supply lines VL2.Here, the first driving voltage VDD1 may be a high-potential voltage fordriving the light emitting elements of the second sub-pixels SP2 in thefirst mode or the power saving mode, and the second driving voltage VDD2may be a high-potential voltage for driving the light emitting elementsof the second sub-pixels SP2 in the second mode or the general mode. Thesecond driving voltage VDD2 may be greater than the first drivingvoltage VDD1. The display device 10 may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform. The second voltage supply line VL2 mayinclude a second horizontal voltage supply line VL2 h and a secondvertical voltage supply line VL2 v.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areato the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is the same as thearea of the transmission area of the sensor area SDA, the number ofsecond sub pixels SP2 per unit area may correspond to half of the numberof first sub pixels SP1 per unit area. Thus, the luminance of the sensorarea SDA may correspond to half of the luminance of the general areaMDA. Accordingly, the display device 10 may set the magnitude of thesecond driving voltage VDD2 to be 2^((1/2)) times or 1.414 times of thefirst driving voltage VDD1, thereby making the luminance of the sensorarea SDA and the luminance of the general area MDA substantiallyuniform. The display device 10 may prevent the reduction of theluminance of the sensor area by controlling the magnitude of the seconddriving voltage VDD2 based on the ratio of the number of the firstsub-pixels SP1 and the number of the second sub-pixels SP2.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,and a mode selector 350.

The display driving circuit 310 may include a first switching elementSW1 and a second switching element SW2, and the power supply unit 330may include a first driving voltage generator 331 and a second drivingvoltage generator 332. The display driving circuit 310 may receive thefirst driving voltage VDD1 through the first driving voltage supply lineVDDL1 and receive the second driving voltage VDD2 through the seconddriving voltage supply line VDDL2.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstdriving voltage supply line VDDL1. The first driving voltage supply lineVDDL1 may be connected to the display driving circuit 310 from the firstdriving voltage generator 331, and the first voltage supply line VL1 maybe connected to the first sub pixels SP1 from the display drivingcircuit 310. Accordingly, the first sub-pixels SP1 may receive the firstdriving voltage VDD1 through the first voltage supply line VL1.

The first driving voltage generator 331 may be connected to the firstswitching element SW1 of the display driving circuit 310 through thefirst driving voltage supply line VDDL1. The first driving voltagegenerator 331 may generate a first driving voltage VDD1 and supply thefirst driving voltage VDD1 to the first switching element SW1. The firstswitching element SW1 may selectively supply the first driving voltageVDD1 to the second voltage supply line VL2 based on a first mode signalMS1. For example, the first switching element SW1 may receive the firstmode signal MS1 from the mode selector 350 to be turned on. The modeselector 350 may supply the first mode signal MS1 to the first switchingelement SW1 of the display driving circuit 310 in the first mode or thepower saving mode. Accordingly, the second sub-pixels SP2 may receivethe first driving voltage VDD1 through the second voltage supply lineVL2 in the first mode.

The second driving voltage generator 332 may be connected to the secondswitching element SW2 of the display driving circuit 310 through thesecond driving voltage supply line VDDL2. The second driving voltagegenerator 332 may generate a second driving voltage VDD2 and supply thesecond driving voltage VDD2 to the second switching element SW2. Thesecond switching element SW2 may selectively supply the second drivingvoltage VDD2 to the second voltage supply line VL2 based on a secondmode signal MS2. For example, the second switching element SW2 mayreceive the second mode signal MS2 from the mode selector 350 to beturned on. The mode selector 350 may supply the second mode signal MS2to the second switching element SW2 of the display driving circuit 310in the second mode or the general mode. Accordingly, the secondsub-pixels SP2 may receive the second driving voltage VDD2 through thesecond voltage supply line VL2 in the second mode.

Accordingly, the display driving circuit 310 may supply the firstdriving voltage VDD1 to the second sub-pixels SP2 in the first mode toreduce the power consumption of the display device 10, and may supplythe second driving voltage VDD2 to the second sub-pixels SP2 in thesecond mode to make the luminance of the general area MDA and theluminance of the sensor area SDA substantially uniform.

The mode selector 350 may be disposed in the protrusion area PA of thedisplay panel 300 to supply the first or second mode signals MS1 or MS2to the display driving circuit 310. For example, when the displaydriving circuit 310 is disposed in the non-display area NDA of thedisplay panel 300, the mode selector 350 may also be disposed in thenon-display area NDA.

The mode selector 350 may supply the first mode signal MS1 to the firstswitching element SW1 in the first mode, and supply the second modesignal MS2 to the second switching element SW2 in the second mode,thereby controlling the driving mode of the display device 10.

FIG. 10 is a plan view of a display device according to exemplaryembodiment of the present invention, and FIG. 11 is a view showing adisplay panel, a power supply unit and a first switching unit of thedisplay device of FIG. 10, according to an exemplary embodiment of thepresent invention. The display device of FIGS. 10 and 11 is differentfrom the aforementioned display device in that the configuration ofsupplying first and second driving voltages VDD1 and VDD2 is different.Therefore, configurations that are the same as the above-describedconfigurations may be briefly described or omitted.

Referring to FIGS. 10 and 11, the display panel 300 may include ageneral area MDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EML, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, the first driving voltageVDD1 may be a high-potential voltage for driving the light emittingelements of the first sub-pixels SP1. The first voltage supply line VL1may include a first horizontal voltage supply line VL1 h and a firstvertical voltage supply line VL1 v.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, and emission control lines EML, anddata lines DL. In addition, the second voltage supply lines VL2 areconnected to the second sub-pixels SP2.

The second sub-pixels SP2 may receive a first driving voltage VDD1 or asecond driving voltage VDD2 through second voltage supply lines VL2.Here, the first driving voltage VDD1 may be a high-potential voltage fordriving the light emitting elements of the second sub-pixels SP2 in thefirst mode or the power saving mode, and the second driving voltage VDD2may be a high-potential voltage for driving the light emitting elementsof the second sub-pixels SP2 in the second mode or the general mode. Thesecond driving voltage VDD2 may be greater than the first drivingvoltage VDD1. The display device 10 may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform. The second voltage supply line VL2 mayinclude a second horizontal voltage supply line VL2 h and a secondvertical voltage supply line VL2 v.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areato the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is substantially thesame as the area of the transmission area of the sensor area SDA, thenumber of second sub pixels SP2 per unit area may correspond to abouthalf of the number of first sub pixels SP1 per unit area. Thus, theluminance of the sensor area SDA may correspond to about half of theluminance of the general area MDA. Accordingly, the display device 10may set the magnitude of the second driving voltage VDD2 to be about2^((1/2)) times or about 1.414 times of the first driving voltage VDD1,thereby making the luminance of the sensor area SDA and the luminance ofthe general area MDA substantially uniform. The display device 10 mayprevent the reduction of the luminance of the sensor area by controllingthe magnitude of the second driving voltage VDD2 based on the ratio ofthe number of the first sub-pixels SP1 to the number of the secondsub-pixels SP2.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,a mode selector 350, and a first switching unit 360.

The power supply unit 330 may include a first driving voltage generator331 and a second driving voltage generator 332, and the first switchingunit 360 may include a first switching element SW1 and a secondswitching element SW2. The first switching unit 360 may receive thefirst driving voltage VDD1 through the first driving voltage supply lineVDDL1 and receive the second driving voltage VDD2 through the seconddriving voltage supply line VDDL2.

For example, the power supply unit 330 and the first switching unit 360may be mounted on the circuit board 320, but the present invention isnot limited thereto.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstdriving voltage supply line VDDL1. The first driving voltage supply lineVDDL1 may be connected to the first switching unit 360 from the firstdriving voltage generator 331, and the first voltage supply line VL1 maybe connected to the first sub pixels SP1 from the first switching unit360. Accordingly, the first sub-pixels SP1 may receive the first drivingvoltage VDD1 through the first voltage supply line VL1.

The first driving voltage generator 331 may be connected to the firstswitching element SW1 of the first switching unit 360 through the firstdriving voltage supply line VDDL1. The first driving voltage generator331 may generate a first driving voltage VDD1 and supply the firstdriving voltage VDD1 to the first switching element SW1 through thefirst driving voltage supply line VDDL1. The first switching element SW1may selectively supply the first driving voltage VDD1 to the secondvoltage supply line VL2 based on a first mode signal MS1. For example,the first switching element SW1 may receive the first mode signal MS1from the mode selector 350 to be turned on. The mode selector 350 maysupply the first mode signal MS1 to the first switching element SW1 ofthe first switching unit 360 in the first mode or the power saving mode.Accordingly, the second sub-pixels SP2 may receive the first drivingvoltage VDD1 through the second voltage supply line VL2 in the firstmode.

The second driving voltage generator 332 may be connected to the secondswitching element SW2 of the first switching unit 360 through the seconddriving voltage supply line VDDL2. The second driving voltage generator332 may generate a second driving voltage VDD2 and supply the seconddriving voltage VDD2 to the second switching element SW2 through thesecond driving voltage supply line VDDL2. The second switching elementSW2 may selectively supply the second driving voltage VDD2 to the secondvoltage supply line VL2 based on a second mode signal MS2. For example,the second switching element SW2 may receive the second mode signal MS2from the mode selector 350 to be turned on. The mode selector 350 maysupply the second mode signal MS2 to the second switching element SW2 ofthe first switching unit 360 in the second mode or the general mode.Accordingly, the second sub-pixels SP2 may receive the second drivingvoltage VDD2 through the second voltage supply line VL2 in the secondmode.

Accordingly, the first switching unit 360 may supply the first drivingvoltage VDD1 to the second sub-pixels SP2 in the first mode to reducethe power consumption of the display device 10, and may supply thesecond driving voltage VDD2 to the second sub-pixels SP2 in the secondmode to make the luminance of the general area MDA and the luminance ofthe sensor area SDA substantially uniform.

FIG. 12 is a plan view of a display device according to an exemplaryembodiment of the present invention. The display device of FIG. 12 isdifferent from the aforementioned display device in that theconfiguration of supplying first and second driving voltages VDD1 andVDD2 is different. Therefore, configurations that are the same as theabove-described configurations may be briefly described or omitted.

Referring to FIG. 12, the display panel 300 may include a general areaMDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EL, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, the first driving voltageVDD1 may be a high-potential voltage for driving the light emittingelements of the first sub-pixels SP1. The first voltage supply line VL1may include a first horizontal voltage supply line VL1 h and a firstvertical voltage supply line VL1 v.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, and emission control lines EL, and datalines DL. In addition, the second voltage supply lines VL2 are connectedto the second sub-pixels SP2

The second sub-pixels SP2 may receive a first driving voltage VDD1 or asecond driving voltage VDD2 through second voltage supply lines VL2.Here, the first driving voltage VDD1 may be a high-potential voltage fordriving the light emitting elements of the second sub-pixels SP2 in thefirst mode or the power saving mode, and the second driving voltage VDD2may be a high-potential voltage for driving the light emitting elementsof the second sub-pixels SP2 in the second mode or the general mode. Thesecond driving voltage VDD2 may be greater than the first drivingvoltage VDD1. The display device 10 may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform. The second voltage supply line VL2 mayinclude a second horizontal voltage supply line VL2 h and a secondvertical voltage supply line VL2 v.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areato the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is substantially thesame as the area of the transmission area of the sensor area SDA, thenumber of second sub pixels SP2 per unit area may correspond to abouthalf of the number of first sub pixels SP1 per unit area. Thus, theluminance of the sensor area SDA may correspond to about half of theluminance of the general area MDA. Accordingly, the display device 10may set the magnitude of the second driving voltage VDD2 to be about2^((1/2)) times or about 1.414 times of the first driving voltage VDD1,thereby making the luminance of the sensor area SDA and the luminance ofthe general area MDA substantially uniform. The display device 10 mayprevent the reduction of the luminance of the sensor area by controllingthe magnitude of the second driving voltage VDD2 based on the ratio ofthe number of the first sub-pixels SP1 to the number of the secondsub-pixels SP2.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,a mode selector 350, and a second switching unit 370.

The power supply unit 330 may include a first driving voltage generator331 and a second driving voltage generator 332, and the second switchingunit 370 may include a first switching element SW1 and a secondswitching element SW2. The second switching unit 370 may receive thefirst driving voltage VDD1 through the first driving voltage supply lineVDDL1 and receive the second driving voltage VDD2 through the seconddriving voltage supply line VDDL2.

The power supply unit 330 may be mounted on the circuit board 320, andthe second switching unit 370 may be disposed in the non-display areaNDA of the display panel 300. For example, the second switching unit 370may be disposed at one edge or corner of the non-display area NDA, butthe present invention is not limited thereto. For example, the secondswitching unit 370 may be provided between the general area MDA and thedisplay driving circuit 310.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstdriving voltage supply line VDDL1. The first driving voltage supply lineVDDL1 may be connected to the display driving circuit 310 from the firstdriving voltage generator 331, and may be connected to the firstswitching element SW1 from the display driving circuit 310. The firstswitching element SW1 is connected to the first voltage supply line VL1,and the first driving voltage VDD1 is transferred to the first switchingelement SW1. Accordingly, the first sub-pixels SP1 may receive the firstdriving voltage VDD1 through the first voltage supply line VL1.

The first driving voltage generator 331 may be connected to the firstswitching element SW1 of the second switching unit 370 through the firstdriving voltage supply line VDDL1. The first driving voltage generator331 may generate a first driving voltage VDD1 and supply the firstdriving voltage VDD1 to the first switching element SW1. The firstswitching element SW1 may selectively supply the first driving voltageVDD1 to the second voltage supply line VL2 based on a first mode signalMS1. For example, the first switching element SW1 may receive the firstmode signal MS1 from the mode selector 350 to be turned on. The modeselector 350 may supply the first mode signal MS1 to the first switchingelement SW1 of the second switching unit 370 in the first mode or thepower saving mode. Accordingly, the second sub-pixels SP2 may receivethe first driving voltage VDD1 through the second voltage supply lineVL2 in the first mode.

The second driving voltage generator 332 may be connected to the secondswitching element SW2 of the second switching unit 370 through thesecond driving voltage supply line VDDL2. The second driving voltagesupply line VDDL2 may be connected to the display driving circuit 310from the second driving voltage generator 332, and may be connected tothe second switching unit 370 from the display driving circuit 310. Thesecond driving voltage generator 332 may generate a second drivingvoltage VDD2 and supply the second driving voltage VDD2 to the secondswitching element SW2. The second switching element SW2 may selectivelysupply the second driving voltage VDD2 to the second voltage supply lineVL2 based on a second mode signal MS2. For example, the second switchingelement SW2 may receive the second mode signal MS2 from the modeselector 350 to be turned on. The mode selector 350 may supply thesecond mode signal MS2 to the second switching element SW2 of the secondswitching unit 370 in the second mode or the general mode. Accordingly,the second sub-pixels SP2 may receive the second driving voltage VDD2through the second voltage supply line VL2, which is connected to thesecond switching element SW2, in the second mode.

Accordingly, the second switching unit 370 may supply the first drivingvoltage VDD1 to the second sub-pixels SP2 in the first mode to reducethe power consumption of the display device 10, and may supply thesecond driving voltage VDD2 to the second sub-pixels SP2 in the secondmode to make the luminance of the general area MDA and the luminance ofthe sensor area SDA substantially uniform.

FIG. 13 is a plan view of a display device according to an exemplaryembodiment of the present invention. The display device of FIG. 13 isdifferent from the aforementioned display device in that theconfiguration of supplying first and second driving voltages VDD1 andVDD2 is different. Therefore, configurations that are the same as theabove-described configurations may be briefly described or omitted.

Referring to FIG. 13, the display panel 300 may include a general areaMDA, a sensor area SDA, and a non-display area NDA.

The general area MDA includes first sub-pixels SP1, first voltage supplylines VL1, scan lines SL, and emission control lines EML, and data linesDL. In addition, the first voltage supply lines VL1 are connected to thefirst sub-pixels SP1.

The first sub-pixels SP1 may receive a first driving voltage VDD1through first voltage supply lines VL1. Here, the first driving voltageVDD1 may be a high-potential voltage for driving the light emittingelements of the first sub-pixels SP1. The first voltage supply line VL1may include a first horizontal voltage supply line VL1 h and a firstvertical voltage supply line VL1 v.

The sensor area SDA may include second sub-pixels SP2, second voltagesupply lines VL2, scan lines SL, and emission control lines EML, anddata lines DL. In addition, the second voltage supply lines VL2 areconnected to the second sub-pixels SP2.

The second sub-pixels SP2 may receive a first driving voltage VDD1 or asecond driving voltage VDD2 through second voltage supply lines VL2.Here, the first driving voltage VDD1 may be a high-potential voltage fordriving the light emitting elements of the second sub-pixels SP2 in thefirst mode or the power saving mode, and the second driving voltage VDD2may be a high-potential voltage for driving the light emitting elementsof the second sub-pixels SP2 in the second mode or the general mode. Thesecond driving voltage VDD2 may be greater than the first drivingvoltage VDD1. The display device 10 may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform. The second voltage supply line VL2 mayinclude a second horizontal voltage supply line VL2 h and a secondvertical voltage supply line VL2 v.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areato the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is substantially thesame as the area of the transmission area of the sensor area SDA, thenumber of second sub pixels SP2 per unit area may correspond to abouthalf of the number of first sub pixels SP1 per unit area. Thus, theluminance of the sensor area SDA may correspond to about half of theluminance of the general area MDA. Accordingly, the display device 10may set the magnitude of the second driving voltage VDD2 to be about2^((1/2)) times or about 1.414 times of the first driving voltage VDD1,thereby making the luminance of the sensor area SDA and the luminance ofthe general area MDA substantially uniform. The display device 10 mayprevent the reduction of the luminance of the sensor area by controllingthe magnitude of the second driving voltage VDD2 based on the ratio ofthe number of the first sub-pixels SP1 to the number of the secondsub-pixels SP2.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, a touch driving circuit 340,a mode selector 350, a first switching element SW1, and a secondswitching element SW2.

The power supply unit 330 may include a first driving voltage generator331 and a second driving voltage generator 332.

The first driving voltage generator 331 may generate a first drivingvoltage VDD1 and supply the first driving voltage VDD1 to the firstdriving voltage supply line VDDL1. The first driving voltage supply lineVDDL1 may be connected to the display driving circuit 310 from the firstdriving voltage generator 331, and may be connected to the first subpixels SP1 from the display driving circuit 310. For example, the firstdriving voltage supply line VDDL1 may be connected to a node which isconnected to the first voltage supply line VL1. Accordingly, the firstsub-pixels SP1 may receive the first driving voltage VDD1 through thefirst voltage supply line VL1.

The first switching element SW1 may be disposed between the firstvertical voltage supply line VL1 v and the second vertical voltagesupply line VL2 v. The first vertical voltage supply line VL1 v mayreceive the first driving voltage VDD1 through the first driving voltagesupply line VDDL1. The first switching element SW1 may selectivelyconnect the first vertical voltage supply line VL1 v and the secondvertical voltage supply line VL2 v to each other based on the first modesignal MS1. For example, the first switching element SW1 may receive thefirst mode signal MS1 from the mode selector 350 to be turned on. Themode selector 350 may supply the first mode signal MS1 to the firstswitching element SW1 in the first mode or the power saving mode.Accordingly, the second sub-pixels SP2 may receive the first drivingvoltage VDD1 through the second voltage supply line VL2 in the firstmode.

The plurality of first switching elements SW1 may be disposed at oneside of the sensor area SDA. For example, the plurality of firstswitching elements SW1 may be disposed between the sensor area SDA andthe general area MDA. For example, the second horizontal voltage supplyline VL2 h may be disposed at the lower side of the sensor area SDA orthe upper side of the general area MDA, but the present invention is notlimited thereto.

The second driving voltage generator 332 may be connected to the secondswitching element SW2 through the second driving voltage supply lineVDDL2. The second driving voltage supply line VDDL2 may be connected tothe display driving circuit 310 from the second driving voltagegenerator 332, and may be connected to the second switching element SW2from the display driving circuit 310. The second driving voltagegenerator 332 may generate a second driving voltage VDD2 and supply thesecond driving voltage VDD2 to the second switching element SW2. Thesecond switching element SW2 may selectively supply the second drivingvoltage VDD2 to the second voltage supply line VL2 based on a secondmode signal MS2. For example, the second switching element SW2 mayreceive the second mode signal MS2 from the mode selector 350 to beturned on. The mode selector 350 may supply the second mode signal MS2to the second switching element SW2 in the second mode or the generalmode. Accordingly, the second sub-pixels SP2 may receive the seconddriving voltage VDD2 through the second voltage supply line VL2 in thesecond mode.

The second switching element SW2 may be disposed in the non-display areaNDA of the display panel 300. For example, the second switching elementSW2 may be disposed adjacent to a side of the general area MDA. Forexample, the second switching element SW2 may be disposed at one edge orcorner of the non-display area NDA, but the present invention is notlimited thereto.

The display panel 300 may include a first vertical mode signal line MS1v and a first horizontal mode signal line MS1 h that supply the firstmode signal MS1 to the first switching element SW1. The first verticalmode signal line MS1 v and the first horizontal mode signal line MS1 hmay be disposed on different layers on the substrate of the displaypanel 300. The first horizontal mode signal line MS1 h may be disposedon a first layer on the substrate, and the first vertical mode signalline MS1 v may be disposed on a second layer disposed on the firstlayer. The first horizontal mode signal line MS1 h and the firstvertical mode signal line MS1 v may be connected to each other through acontact hole. For example, the first horizontal mode signal line MS1 hmay be disposed on the same layer as the gate electrode of the firstswitching element SW1, and the first vertical mode signal line MS1 v maybe disposed on the same layer as the source electrode and drainelectrode of the first switching element SW1, but the present inventionis limited thereto.

Accordingly, the display panel 300 may supply the first driving voltageVDD1 to the second sub-pixels SP2 in the first mode to reduce the powerconsumption of the display device 10, and may supply the second drivingvoltage VDD2 to the second sub-pixels SP2 in the second mode to make theluminance of the general area MDA and the luminance of the sensor areaSDA substantially uniform.

FIG. 14 is a plan view of a display device according to an exemplaryembodiment of the present invention, and FIG. 15 is a plan view of adisplay device according to an exemplary embodiment of the presentinvention. The display device of FIGS. 14 and 15 is different from theaforementioned display device in that the configuration of a protrusionarea PA and the configuration of a circuit board 320 attached to a padarea PDA of the protrusion area PA are different. Therefore,configurations that are the same as the above-described configurationsmay be briefly described or omitted.

Referring to FIGS. 14 and 15, the display panel 300 may include a mainarea MA and a protrusion area PA protruding from one side of the mainarea MA.

The protrusion area PA may protrude from one side of the main area MA.As shown in FIG. 14, the protrusion area PA may protrude from the upperside of the sensor area SDA. For example, the length of the protrusionarea PA in the first direction (X-axis direction) may be smaller thanthe length of the main area MA in the first direction (X-axisdirection).

The protrusion area PA may include a bending area BA and a pad area PDA.In this case, the pad area PDA may be disposed at one side of thebending area BA, and the sensor area SDA may be disposed at the otherside of the bending area BA. For example, the pad area PDA may bedisposed at the upper side of the bending area BA, and the sensor areaSDA may be disposed at the lower side of the bending area BA.

The display panel 300 may include a display driving circuit 310, acircuit board 320, a power supply unit 330, and a touch driving circuit340.

The display driving circuit 310 may be disposed in the pad area PDA. Thedisplay driving circuit 310 may be disposed closer to the sensor areaSDA than the general area MDA. The circuit board 320, which is mountedwith the power supply unit 330 and the touch driving circuit 340, may beattached to the pad area PDA.

Therefore, the lengths of the second voltage supply lines VL2 connectedto the second sub-pixels SP2 may be shorter than those of theaforementioned exemplary embodiments of the present invention (forexample, exemplary embodiments of the present invention described withreference to FIGS. 4, 6, 8, 10, 12, and 13). The second driving voltageVDD2 supplied through the second voltage supply lines VL2 may be greaterthan the first driving voltage VDD1 supplied through the first voltagesupply lines VL1. The display panel 300 may reduce the power consumptiondue to the self-resistance of the voltage supply lines by reducing thelengths of the second voltage supply lines VL2 through which arelatively high voltage flows.

FIG. 16 is a plan view showing a pixel arrangement structure of a sensorarea according to an exemplary embodiment of the present invention.

Referring to FIG. 16, the sensor area SDA may include pixel areas SPA,in each of which the second sub-pixels SP2 are disposed, andtransmission areas TA that transmit light. The transmission area TA maybe surrounded by the second sub-pixels SP2. Since the general area MDAdoes not include the transmission area, the number of second sub-pixelsSP2 per unit area of the sensor area SDA may be smaller than the numberof first sub-pixels SP1 per unit area of the general area MDA.

Each of the pixel areas SPA may include a red sub-pixel SP2_R, a greensub-pixel SP2_G, and a blue sub-pixel SP2_B. Each of the pixel areas SPAmay determine the number of each of the red sub-pixels SP2_R, the greensub-pixels SP2_G, and the blue sub-pixels SP2_B based on the luminancedifference of the red sub-pixel SP2_R, the green sub-pixel SP2_G, andthe blue sub-pixel SP2_B. For example, each of the pixel areas SPA mayinclude four red sub-pixels SP2_R, eight green sub-pixels SP2_G, andfour blue sub-pixels SP2_B in an 8×2 array, but the present invention isnot limited thereto.

The first sub pixels SP1 of the general area MDA may receive the firstdriving voltage VDD1, and the second sub pixels SP2 of the sensor areaSDA may receive the second driving voltage VDD2. For example, themagnitude of the second driving voltage VDD2 may be greater than themagnitude of the first driving voltage VDD1.

The magnitude of the second driving voltage VDD2 may be determinedaccording to a ratio of the number of first sub-pixels SP1 per unit areato the number of second sub-pixels SP2 per unit area. For example, whenthe area of the pixel area of the sensor area SDA is substantially thesame as the area of the transmission area TA of the sensor area SDA, thenumber of second sub pixels SP2 per unit area may correspond to abouthalf of the number of first sub pixels SP1 per unit area. Thus, theluminance of the sensor area SDA may correspond to about half of theluminance of the general area MDA. Accordingly, the display device 10may set the magnitude of the second driving voltage VDD2 to be about2^((1/2)) times or about 1.414 times of the first driving voltage VDD1,thereby making the luminance of the sensor area SDA and the luminance ofthe general area MDA substantially uniform. The display device 10 mayprevent the reduction of the luminance of the sensor area by controllingthe magnitude of the second driving voltage VDD2 based on the ratio ofthe number of the first sub-pixels SP1 to the number of the secondsub-pixels SP2.

FIG. 17 is a circuit diagram showing first sub-pixels according to anexemplary embodiment of the present invention, and FIG. 18 is a circuitdiagram showing second sub-pixels according to an exemplary embodimentof the present invention. The first sub-pixels SP1 may be disposed inthe general area MDA and connected to the first driving voltage lineVL1, and the second sub-pixels SP2 may be disposed in the sensor areaSDA and connected to the second driving voltage line VL2. Except forthese differences, the configuration (for example, the configuration ofthe driving transistor DT and the plurality of transistors) of the pixelcircuit of the first sub-pixels SP1 may be substantially the same as theconfiguration of the pixel circuit of the second sub-pixels SP2.Hereinafter, the pixel circuit of the first sub-pixels SP1 will bemainly described, and a redundant description of the pixel circuit ofthe second sub-pixels SP2 may be omitted.

Referring to FIGS. 17 and 18, the first sub-pixel SP1 may overlap ap−1-th scan line SL (p−1), a p-th scan line SLp, and a j-th data lineDLj. The first sub-pixel SP1 may be connected to a first voltage supplyline VL1 to which a first driving voltage VDD1 is supplied, aninitialization voltage line VIL to which an initialization voltage issupplied, and a third voltage supply line VSSL to which a third drivingvoltage is supplied.

The first sub-pixel SP1 may include a driving transistor DT, a lightemitting element E, switching elements, and a first capacitor C1. Theswitching elements may include first to sixth transistors ST1, ST2, ST3,ST4, ST5, and ST6.

The driving transistor DT may include a gate electrode, a sourceelectrode, and a drain electrode. The driving transistor DT may controla source-drain current Isd (hereinafter, referred to as a “drivingcurrent”) according to a data voltage applied to the gate electrode ofthe driving transistor DT. The driving current Isd flowing through achannel of the driving transistor DT may be proportional to the squareof a difference between the voltage Vsg between the source electrode andgate electrode of the driving transistor DT and the threshold voltageVth (Isd=k′×(Vsg−Vth)²). Here, k′ refers to a proportionalitycoefficient determined by the structure and physical characteristics ofthe driving transistor DT. In addition, Vsg refers to a source-gatevoltage of the driving transistor DT, and Vth refers to a thresholdvoltage of the driving transistor DT.

The light emitting element E may receive the driving current Isd to emitlight. The emission amount or luminance of the light emitting element Emay be proportional to the magnitude of the driving current Isd.

The light emitting element E may be an organic light emitting diodeincluding an anode electrode, a cathode electrode, and an organic lightemitting layer disposed between the anode electrode and the cathodeelectrode. In addition, the light emitting element E may be an inorganiclight emitting element including an anode electrode, a cathodeelectrode, and an inorganic semiconductor disposed between the anodeelectrode and the cathode electrode. In addition, the light emittingelement E may be a quantum dot light emitting element including an anodeelectrode, a cathode electrode, and a quantum dot light emitting layerdisposed between the anode electrode and the cathode electrode. Inaddition, the light emitting element E may be a micro light emittingdiode.

The anode electrode of the light emitting element E may be connected tothe drain electrode of the fifth transistor ST5 and the drain electrodeof the sixth transistor ST6, and the cathode electrode of the lightemitting element E may be connected to the third voltage supply lineVSSL. A parasitic capacitance Ce1 may be formed between the anodeelectrode and cathode electrode of the light emitting element E.

The first transistor ST1 may be formed as a dual transistor including afirst-first transistor ST1-1 and a first-second transistor ST1-2. Thefirst-first transistor ST1-1 and the first-second transistor ST1-2 maybe turned on by the scan signal of the p−1-th scan line SL (p−1) toconnect the gate electrode of the driving transistor DT to theinitialization voltage line VIL. The gate electrode of the drivingtransistor DT may be discharged to the initialization voltage of theinitialization voltage line VIL. The gate electrode of the first-firsttransistor ST1-1 may be connected to the p−1-th scan line SL (p−1), thesource electrode thereof may be connected to the gate electrode of thedriving transistor DT, and the drain electrode thereof may be connectedto the source electrode of the first-second transistor ST1-2. The gateelectrode of the first-second transistor ST1-2 may be connected to thep−1-th scan line SL (p−1), the source electrode thereof may be connectedto the drain electrode of the first-first transistor ST1-1, and thedrain electrode thereof may be connected to the initialization voltageline VIL.

The second transistor ST2 may be turned on by the scan signal of thep-th scan line SLp to connect the source electrode of the drivingtransistor DT to the j-th data line Dj. The gate electrode of the secondtransistor ST2 may be connected to the p-th scan line SLp, the sourceelectrode thereof may be connected to the data line Dj, and the drainelectrode thereof may be connected to the source electrode of thedriving transistor DT.

The third transistor ST3 may be formed as a dual transistor including athird-first transistor ST3-1 and a third-second transistor ST3-2. Thethird-first transistor ST3-1 and the third-second transistor ST3-2 maybe turned on by the scan signal of the p-th scan line SLp to connect thegate electrode and drain electrode of the driving transistor DT to eachother. For example, when the third-first transistor ST3-1 and thethird-second transistor ST3-2 are turned on, since the gate electrodeand drain electrode of the driving transistor DT are connected to eachother, the driving transistor DT may be driven as a diode. The gateelectrode of the third-first transistor ST3-1 may be connected to thep-th scan line SLp, the source electrode of the third-first transistorST3-1 may be connected to the drain electrode of the driving transistorDT, and the drain electrode of the third-first transistor ST3-1 may beconnected to the source electrode of the third-second transistor ST3-2.The gate electrode of the third-second transistor ST3-2 may be connectedto the p-th scan line SLp, the source electrode of the third-secondtransistor ST3-2 may be connected to the drain electrode of thethird-first transistor ST3-1, and the drain electrode of thethird-second transistor ST3-2 may be connected to the gate electrode ofthe driving transistor DT.

The fourth transistor ST4 may be turned on by the emission signal of thep-th emission line ELp to connect the source electrode of the drivingtransistor DT to the first voltage supply line VL1. The gate electrodeof the fourth transistor ST4 may be connected to the p-th light emissionline ELp, the source electrode of the fourth transistor ST4 may beconnected to the first voltage supply line VL1, and the drain electrodeof the fourth transistor ST4 may be connected to the source electrode ofthe driving transistor DT.

The fifth transistor ST5 may be connected between the drain electrode ofthe driving transistor DT and the anode electrode of the light emittingelement E. The fifth transistor ST5 may be turned on by the emissionsignal of the p-th emission line ELp to connect the drain electrode ofthe driving transistor DT to the anode electrode of the light emittingelement E. The gate electrode of the fifth transistor ST5 may beconnected to the p-th emission line ELp, the source electrode of thefifth transistor ST5 may be connected to the drain electrode of thedriving transistor DT, and the drain electrode of the fifth transistorST5 may be connected to the anode electrode of the light emittingelement E. When both the fourth transistor ST4 and the fifth transistorST5 are turned on, the driving current Isd may be supplied to the lightemitting element E.

The sixth transistor ST6 may be turned on by the scan signal of the p-thscan line SLp to connect the initialization voltage line VIL to theanode electrode of the light emitting element E. The sixth transistorST6 may be turned on based on the scan signal from the p-th scan lineSLp, and thus the anode electrode of the light emitting element E may bedischarged to the initialization voltage. The gate electrode of thesixth transistor ST6 may be connected to the p-th scan line SLp, thesource electrode of the sixth transistor ST6 may be connected to theinitialization voltage line VIL, and the drain electrode of the sixthtransistor ST6 may be connected to the anode electrode of the lightemitting element E.

The first capacitor CI may be formed between the source electrode of thedriving transistor DT and the first voltage supply line VL1. Oneelectrode of the first capacitor C1 may be connected to the sourceelectrode of the driving transistor DT, and the other electrode thereofmay be connected to the first voltage supply line VL2.

Although it is shown in FIGS. 17 and 18 that the first to sixthtransistors ST1, ST2, ST3, ST4, ST5, and ST6 and the driving transistorDT are formed as P-type metal oxide semiconductor field effecttransistors (P-type MOSFETs), the present invention is not limitedthereto, and these transistors may be formed as N-type MOSFETs.

Each of the first to sixth transistors ST1, ST2, ST3, ST4, ST5, and ST6and the driving transistor DT may be formed of an active layer includingany one of, for example, polycrystalline silicon, amorphous silicon, oran oxide semiconductor. When the semiconductor layer of each of thefirst to sixth transistors ST1, ST2, ST3, ST4, ST5, and ST6 and thedriving transistor DT includes polycrystalline silicon, thesetransistors may be formed through a low-temperature polycrystallinesilicon (LTPS) process.

FIG. 19 is a cross-sectional view of a display device according to anexemplary embodiment of the present invention.

Referring to FIG. 19, the voltage supply line VL may include ahorizontal voltage supply line VLh and a vertical voltage supply lineVLv. For example, the horizontal voltage supply line VLh may be a firstor second horizontal voltage supply line VL1 h or VL2 h, and thevertical voltage supply line VLv may be a first or second verticalvoltage supply line VL1 v or VL2 v.

The horizontal voltage supply line VLh and the vertical voltage supplyline VLv may be disposed on different layers on the substrate SUB of thedisplay panel 300. The horizontal voltage supply line VLh may bedisposed on a first layer disposed on the substrate SUB, and thevertical voltage supply line VLv may be disposed on a second layerdisposed on the first layer. For example, the first layer may be a gateinsulating film GI, and the second layer may be the interlayerinsulating film ILD. The horizontal voltage supply line VLh and thevertical voltage supply line VLv may be connected to each other througha contact hole.

For example, the horizontal voltage supply line VLh may be disposed onthe same layer as the gate electrode GE of the thin film transistor Tdisposed on the substrate SUB, and the vertical voltage supply line VLvmay be disposed on the same layer as the source electrode SE and drainelectrode DE of the thin film transistor T. However, the presentinvention is not limited thereto.

For example, the horizontal voltage supply line VLh may be disposed onthe same layer as the gate electrode of the thin film transistor of thescan driver 410 or the emission control driver 420. The vertical voltagesupply line VLv may be disposed on the same layer as the sourceelectrode and drain electrode of the thin film transistor of the scandriver 410 or the emission control driver 420.

In a display device according to an exemplary embodiment of the presentinvention, since the sensor area of a display panel includes sensordevices, the number of pixels in the sensor area is smaller than thenumber of pixels in the general area of the display panel. Drivingvoltages different from each other are supplied to the pixels of thegeneral area and the pixels of the sensor area, respectively. Therefore,the luminance of the general area and the luminance of the sensor areamay be substantially uniform.

In a display device according to an exemplary embodiment of the presentinvention, a first driving voltage may be supplied to the pixels in thegeneral area of the display panel, a first driving voltage may besupplied to the pixels in the sensor area of the display panel at thefirst mode, and a second driving voltage, which is higher than the firstdriving voltage, may be supplied to the pixels in the sensor area at thesecond mode, thereby reducing the power consumption of the displaydevice.

While the present invention has been described with reference toexemplary embodiments thereof, it will be understood by those ofordinary skill in the art that various changes in form and details maybe made thereto without departing from the spirit and scope of thepresent invention.

What is claimed is:
 1. A display device, comprising: a display panelcomprising a first area and a second area, wherein the first areaincludes first sub-pixels, and the second area includes secondsub-pixels; and a power supply unit that generates a first drivingvoltage and a second driving voltage greater than the first drivingvoltage to supply the first and second driving voltages to the displaypanel, wherein the first sub-pixels receive the first driving voltage,and the second sub-pixels receive the first driving voltage or thesecond driving voltage.
 2. The display device of claim I, wherein thepower supply unit comprises: a first driving voltage generator thatgenerates the first driving voltage; and a second driving voltagegenerator that generates the second driving voltage.
 3. The displaydevice of claim 2, wherein the power supply unit further comprises: afirst switching element selectively connecting the first driving voltagegenerator to the second sub-pixels; and a second switching elementselectively connecting the second driving voltage generator to thesecond sub-pixels.
 4. The display device of claim 3, further comprisinga mode selector that supplies first and second mode signals to the powersupply unit, wherein the first switching element receives the first modesignal from the mode selector to be turned on, and the second switchingelement receives the second mode signal from the mode selector to beturned on.
 5. The display device of claim 2, further comprising adisplay driving circuit that drives the display panel, wherein thedisplay driving circuit comprises: a first switching element selectivelyconnecting the first driving voltage generator to the second sub-pixels;and a second switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.
 6. The display device ofclaim 5, further comprising a mode selector that supplies first andsecond mode signals to the display driving circuit, wherein the firstswitching element receives the first mode signal from the mode selectorto be turned on, and the second switching element receives the secondmode signal from the mode selector to be turned on.
 7. The displaydevice of claim 2, further comprising a first switching unit mounted ona circuit board, wherein the power supply unit is mounted on the circuitboard, wherein the first switching unit comprises: a first switchingelement selectively connecting the first driving voltage generator tothe second sub-pixels; and a second switching element selectivelyconnecting the second driving voltage generator to the secondsub-pixels.
 8. The display device of claim 7, further comprising a modeselector that supplies first and second mode signals to the firstswitching unit, wherein the first switching element receives the firstmode signal from the mode selector to be turned on, and the secondswitching element receives the second mode signal from the mode selectorto be turned on.
 9. The display device of claim 2, further comprising asecond switching unit disposed on a substrate of the display panel,wherein the second switching unit comprises: a first switching elementselectively connecting the first driving voltage generator to the secondsub-pixels; and a second switching element selectively connecting thesecond driving voltage generator to the second sub-pixels.
 10. Thedisplay device of claim 9, further comprising a mode selector supplyingfirst and second mode signals to the second switching unit, wherein thefirst switching element receives the first mode signal from the modeselector to be turned on, and the second switching element receives thesecond mode signal from the mode selector to be turned on.
 11. Thedisplay device of claim 1, wherein the display panel comprises: a firsthorizontal voltage supply line disposed at one side of the first area; afirst vertical voltage supply line connected to the first horizontalvoltage supply line, wherein the first vertical voltage supply linesupplies the first driving voltage to the first sub-pixels; a secondhorizontal voltage supply line disposed at one side of the second area;and a second vertical voltage supply line connected to the secondhorizontal voltage supply line, wherein the second vertical voltagesupply line supplies the first driving voltage or the second drivingvoltage to the second sub-pixels.
 12. The display device of claim 11,wherein the display panel further comprises: a first switching elementdisposed between the first vertical voltage supply line and the secondvertical voltage supply line; and a second switching element selectivelysupplying the second driving voltage to the second horizontal voltagesupply line.
 13. The display device of claim 12, further comprising amode selector that supplies first and second mode signals to the firstand second switching elements, wherein the first switching elementreceives the first mode signal from the mode selector to be turned on,and the second switching element receives the second mode signal fromthe mode selector to be turned on.
 14. The display device of claim 1,wherein a number of the first sub-pixels per unit area of the first areais larger than a number of the second sub-pixels per unit area of thesecond area.
 15. A display device, comprising: a display panelcomprising a first area and a second area, wherein the first areaincludes first sub-pixels, and the second area includes secondsub-pixels, wherein the display panel comprises: a first horizontalvoltage supply line disposed at one side of the first area; a firstvertical voltage supply line connected to the first horizontal voltagesupply line, wherein the first vertical voltage supply line supplies afirst driving voltage to the first sub-pixels; a second horizontalvoltage supply line disposed at one side of the second area; and asecond vertical voltage supply line connected to the second horizontalvoltage supply line, wherein the second vertical voltage supply linesupplies the first driving voltage or a second driving voltage greaterthan the first driving voltage to the second sub-pixels.
 16. The displaydevice of claim 15, wherein the first horizontal voltage supply line andthe second horizontal voltage supply line are disposed on a first layerdisposed on a substrate of the display panel, and the first verticalvoltage supply line and the second vertical voltage supply line aredisposed on a second layer disposed on the first layer.
 17. The displaydevice of claim 15, wherein each of the first sub-pixels and the secondsub-pixels further comprises a thin film transistor including an activelayer, a gate electrode, a source electrode, and a drain electrode, andwherein the first horizontal voltage supply line and the secondhorizontal voltage supply line are disposed on the same layer as thegate electrode, and the first vertical voltage supply line and thesecond vertical voltage supply line are disposed on the same layer asthe source electrode and the drain electrode.
 18. The display device ofclaim 15, further comprising a power supply unit including a firstdriving voltage generator that generates the first driving voltage and asecond driving voltage generator that generates the second drivingvoltage.
 19. The display device of claim 18, wherein the power supplyunit further comprises: a first switching element selectively connectingthe first driving voltage generator to the second sub-pixels; and asecond switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.
 20. The display device ofclaim 18, further comprising a display driving circuit that drives thedisplay panel, wherein the display driving circuit further comprises: afirst switching element selectively connecting the first driving voltagegenerator to the second sub-pixels; and a second switching elementselectively connecting the second driving voltage generator to thesecond sub-pixels.
 21. The display device of claim 18, furthercomprising a first switching unit mounted on a circuit board, whereinthe power supply unit is mounted on the circuit board, wherein the firstswitching unit comprises: a first switching element selectivelyconnecting the first driving voltage generator to the second sub-pixels;and a second switching element selectively connecting the second drivingvoltage generator to the second sub-pixels.
 22. The display device ofclaim 18, further comprising a second switching unit disposed on asubstrate of the display panel, wherein the second switching unitcomprises: a first switching element selectively connecting the firstdriving voltage generator to the second sub-pixels; and a secondswitching element selectively connecting the second driving voltagegenerator to the second sub-pixels.
 23. The display device of claim 18,wherein the display panel comprises: a first switching element disposedbetween the first vertical voltage supply line and the second verticalvoltage supply line; and a second switching element selectivelyconnecting the second driving voltage generator to the second horizontalvoltage supply line.
 24. A display device, comprising: a display panelcomprising a first area and a second area, wherein the first areaincludes first sub-pixels and a first voltage supply line connected tothe first sub-pixels, wherein the second area includes secondsub-pixels, a second voltage supply line connected to the secondsub-pixels, and a plurality of sensors; a first driving voltagegenerator connected to the first sub-pixels and that generates a firstdriving voltage; a second driving voltage generator that generates asecond driving voltage; a first switching element selectively connectingthe first driving voltage generator to the second voltage supply lineand the second sub-pixels; and a second switching element selectivelyconnecting the second driving voltage generator to the second voltagesupply line and the second sub-pixels.